The fastest and easiest way to secure your Fastway E series Ball Mount and protect it from theft. Kit includes two keyed alike locking pins: a long span hitch pin for the receiver (5/8" diameter) that fits 2" class III, IV, and V receivers, and one for the ball height adjustment (1/2" diameter).Ball Mount Sold Separately. | Fastway E-Series Dual Lock Pack for Ball Mounts